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A preparation method for sintering zirconium-aluminum composite eutectic ceramics using flash firing technology

A technology of eutectic ceramics and flash firing, which is applied in the field of preparation of zirconium-aluminum composite eutectic ceramics sintered by flash firing technology, can solve problems such as scarcity of material systems, and achieve uniform eutectic morphology, high controllability, and equipment simple effect

Active Publication Date: 2020-02-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under such high-temperature service conditions, it is difficult for traditional metal materials and general composite materials to maintain their corresponding structural strength. If the oxidative environment in which the materials serve is considered comprehensively, the applicable material systems are even scarcer.

Method used

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  • A preparation method for sintering zirconium-aluminum composite eutectic ceramics using flash firing technology
  • A preparation method for sintering zirconium-aluminum composite eutectic ceramics using flash firing technology
  • A preparation method for sintering zirconium-aluminum composite eutectic ceramics using flash firing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a kind of Al 2 o 3 -The preparation method of YSE eutectic ceramics, comprises the steps:

[0028] (1) Weighing Al at a molar ratio of 1:1 2 o 3 , YSE, adding ethanol, ball milling for 24 hours, and drying to obtain the precursor powder;

[0029] (2) Add a polyvinyl alcohol aqueous solution binder with a mass fraction of 5% to the precursor powder, the mass ratio of the precursor powder to the binder is 50:1, grind evenly, and dry it by cold isostatic pressing 200MPA Pressed into flakes, the size of the flake precursor is 15mm in diameter and 3mm in thickness;

[0030] (3) Place the flake precursor in a flash furnace, raise the temperature to 900°C at 5°C / min, and apply a field strength of 100V / cm to the precursor through a power supply of 500V and 5A at the same time as the temperature rises. When the temperature reaches 900 At a constant temperature of ℃, flash burning occurs after 1min, and the current will change rapidly at the same time. The current is control...

Embodiment 2

[0033] a kind of Al 2 o 3 -The preparation method of YSE eutectic ceramics, comprises the steps:

[0034] (1) Weighing Al at a molar ratio of 1:1 2 o 3 , YSE, adding ethanol, ball milling for 24 hours, and drying to obtain the precursor powder;

[0035] (2) Add a polyvinyl alcohol aqueous solution binder with a mass fraction of 5% to the precursor powder, the mass ratio of the precursor powder to the binder is 50:1, grind evenly, and pass cold isostatic pressing after drying 200MPA is pressed into flakes, and the size of the flake precursor is 15mm in diameter and 3mm in thickness;

[0036] (3) Place the flake precursor in a flash furnace, raise the temperature to 1000°C at 5°C / min, and apply a field strength of 100V / cm to the precursor through a power supply of 500V and 5A at the same time as the temperature rises. When the temperature reaches 1000 At a constant temperature of ℃, flash burning occurs after 1min, and the current will change rapidly at the same time. The c...

Embodiment 3

[0039] a kind of Al2 o 3 -The preparation method of YSE eutectic ceramics, comprises the steps:

[0040] (1) Weighing Al at a molar ratio of 1:1 2 o 3 , YSE, adding ethanol, ball milling for 24 hours, and drying to obtain the precursor powder;

[0041] (2) Add a polyvinyl alcohol aqueous solution binder with a mass fraction of 5% to the precursor powder, the mass ratio of the precursor powder to the binder is 50:1, grind evenly, and pass cold isostatic pressing after drying 200MPA is pressed into flakes, and the size of the flake precursor is 15mm in diameter and 3mm in thickness;

[0042] (3) Place the flake precursor in a flash furnace, raise the temperature to 1100°C at 5°C / min, and apply a field strength of 100V / cm to the precursor through a power supply of 500V and 5A at the same time as the temperature rises. When the temperature reaches 1100 At a constant temperature of ℃, flash burning occurs after 1min, and the current will change rapidly at the same time. The cur...

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Abstract

The invention belongs to the technical field of ceramic preparation and particularly relates to a preparation method of sintering zirconium-aluminum composite eutectic ceramic through the flash sintering technology. The preparation method comprises proportionally and uniformly mixing Al2O3 and YSE, adding in ethanol and performing ball-milling and drying to obtain precursor powder; adding bonding agent into the precursor power for uniform grinding, after the mixture is dried, performing compression molding to obtain an eutectic ceramic precursor; sintering the eutectic ceramic precursor through the flash sintering technology to prepare the Al2O3-YSE eutectic ceramic. According to the preparation method, the flash sintering technology is applied to preparation of the Al2O3-YSE eutectic ceramic, the prepared Al2O3-YSE eutectic ceramic have a rod-like eutectic morphology and is high in high-temperature stability, breaking tenacity and bending strength, and the eutectic morphology is relatively uniform. Compared with other eutectic ceramic preparation methods, the preparation method of sintering the zirconium-aluminum composite eutectic ceramic through the flash sintering technology has the advantages of being simple in equipment, high in controllability during preparation, short in preparation time, energy-efficient and the like.

Description

technical field [0001] The invention belongs to the technical field of ceramic preparation, and in particular relates to a method for preparing zirconium-aluminum multiphase eutectic ceramics sintered by flash firing technology. Background technique [0002] With the continuous development and progress of my country's aerospace industry, the requirements for the service performance of materials under different conditions are constantly increasing, especially high-temperature structural materials, which are increasingly becoming the bottleneck restricting the performance improvement of sophisticated technical equipment such as aerospace flight devices. Among modern technological equipment, the biggest constraint factor in the manufacture of aircraft engines with high thrust-to-weight ratio is the excessively high inlet temperature at the front end of the turbine. For cutting-edge aviation devices, the inlet temperature at the front end of the turbine can even be as high as 165...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/64
CPCC04B35/10C04B35/64C04B2235/666
Inventor 傅正义陈济东
Owner WUHAN UNIV OF TECH
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